2921639 has 4 divisors (see below), whose sum is σ = 3339024. Its totient is φ = 2504256.

The previous prime is 2921629. The next prime is 2921647. The reversal of 2921639 is 9361292.

2921639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2921639 - 2⁴ = 2921623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2921629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208682 + ... + 208695.

It is an arithmetic number, because the mean of its divisors is an integer number (834756).

2^2921639 is an apocalyptic number.

2921639 is a deficient number, since it is larger than the sum of its proper divisors (417385).

2921639 is an equidigital number, since it uses as much as digits as its factorization.

2921639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417384.

The product of its digits is 5832, while the sum is 32.

The square root of 2921639 is about 1709.2802578863. The cubic root of 2921639 is about 142.9581275027.

The spelling of 2921639 in words is "two million, nine hundred twenty-one thousand, six hundred thirty-nine".